Question

Media aritmetica a 5 nr nat consecutile este 19 aflați nr

Answer 1

  I nr = a
 II nr = a + 1
III nr = a  + 2
IV nr = a + 3
 V nr = a + 4

$\frac{a + (a + 1) +( a + 2) + (a + 3) + (a + 4)}{5} =19$
$\frac{5a + 10}{5} =19$
$5a + 10 = 19*5$
$5a + 10 = 95$
$5a = 95 - 10$
$5a = 85 =\ \textgreater \ a = \frac{85}{5} =17$

  I nr = 17
 II nr = 17 + 1 = 18
III nr = 17 + 2 = 19
IV nr = 17 + 3 = 20
 V nr = 17 + 4 = 21